A pot experiment was carried out at the Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh during the period from 28 February to 3 May 2005 to evaluate the effect of different levels of salinity (control, 2 dSm-1, 4 dSm'l and 6 sdSrn'l) on mineral ion content, morpho-physiological and yield contributing characters of four mungbean genotypes (Barimoog-6, Barimoog-3 and two advance line, MB-46 and MB-300). The experiment was laid out in a Randomized Complete Block Design (RQBD) with three replications. All the morpho-physiological characters such as plant height, number of branches plant'', number of leaves plant'', total dry matter (TDM) and yield contributing characters such as number of pods plant'', number of seeds plant'', 1000-seed weight, seed yield planfl and harvest index were gradually decreased with the increase of salinity levels compared to the control. Na + content in leaves increased and K+, Ca', Mg ++ contents decreased with increasing salinity levels. The advanced line MB-46 contained less amount of Na + and higher amount of K+, Ca, Mg++ compared to the other genotypes. Plant height, number of branches plant'', number of leaves plant -I, TDM, number of pods planfl, number of seeds plant'', 1000-seed weight, seed yield plant'l and harvest index were the highest in MB-46 compared to those in other genotypes. Interaction effect between the genotypes and salinity levels appeared significant for most of the characters studied. Considering the performance of the mungbean genotypes the MB-46 performed better than an other genotypes at above salinity levels. This genotype maybe utilized for further breeding and crop improvement program for salt affected regions.